Two types of water pollutants exist:
- point source
- nonpoint source.
Point sources
-occur when harmful substances are emitted directly into a body of water.
- eg. The Exxon Valdez oil
Nonpoint source
- delivers pollutants indirectly through environmental changes.
- eg. fertilizer from a field is carried into a stream by rain, in the form of run-off which in turn effects aquatic life.
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